<div class="progress-bar--container">
  <div class="{!(v.projectCompletionPercentage == 0) ? 'progress-bar--bar progress-bar--zerowidthbar' : 'progress-bar--bar'}" style="{!'width: '+v.projectCompletionPercentage+'%'}">
    <span class="progress-bar--pct-complete-label">{!v.projectCompletionPercentage+'%'}</span>
  </div>
</div>